refactor l2/l3 code for higher performance

Author: bluenet13

ans/ans_main.c

@@ -601,6 +601,8 @@ static inline int ans_send_burst(struct ans_lcore_queue *qconf, uint16_t n, uint
     ret = rte_eth_tx_burst(port, queueid, m_table, n);
     if (unlikely(ret < n))
     {
+        ans_packet_stats(port, n - ret);
+        
         do
         {
             rte_pktmbuf_free(m_table[ret]);

librte_ans/include/ans_init.h

@@ -92,6 +92,18 @@ int ans_register(ans_send_packet_cb send_cb);
  */
  int ans_packet_handle(struct rte_mbuf *m, uint8_t portid);
 
+/**
+ * Handle the received packets by ans stack
+ *
+ * @param portid  
+ *    port id.
+ * @param packets_nb 
+ *    droped packets number. 
+ *
+ * @return  
+ *
+ */
+void ans_packet_stats(uint8_t portid, uint16_t packets_nb);
 
 /**
  * Handle ans internal message.